[PATCH v3 5/7] fix crash in rewrite_branch()

[Luc Van Oostenryck <luc.vanoostenryck@gmail.com>]

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 flow.c                            |  2 +-
 validation/crash-rewrite-branch.c | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 validation/crash-rewrite-branch.c

diff --git a/flow.c b/flow.c
index 23fa7c21b..6cac21b24 100644
--- a/flow.c
+++ b/flow.c
@@ -30,7 +30,7 @@ static int rewrite_branch(struct basic_block *bb,
 	struct basic_block *old,
 	struct basic_block *new)
 {
-	if (*ptr != old || new == old)
+	if (*ptr != old || new == old || !bb->ep)
 		return 0;
 
 	/* We might find new if-conversions or non-dominating CSEs */
diff --git a/validation/crash-rewrite-branch.c b/validation/crash-rewrite-branch.c
new file mode 100644
index 000000000..eb310df1c
--- /dev/null
+++ b/validation/crash-rewrite-branch.c
@@ -0,0 +1,24 @@
+void a(int c, int e)
+{
+	for(;                   b; c ;
+
+	if (()) {
+		unsigned short d = e;
+		if (())
+			while ()
+				;
+		&d;
+	}
+
+	if (()) {
+		int f = &f;
+	}
+}
+
+/*
+ * check-name: crash rewrite_branch
+ * check-command: test-linearize $file
+ *
+ * check-error-ignore
+ * check-output-ignore
+ */
-- 
2.13.2